import java.util.TimerTask;
import java.util.concurrent.Callable;
import java.util.concurrent.ExecutionException;
import java.util.concurrent.Future;
import java.util.concurrent.FutureTask;
import java.util.concurrent.atomic.AtomicInteger;

public class Demo22 {
	public static void main(String[] args) throws ExecutionException, InterruptedException {
		Callable<Integer> callable=new Callable<Integer>() {
			@Override
			public Integer call() throws Exception {
				int sum=0;
				for(int i =0;i<=1000;i++) {
					sum+=i;
				}
				return sum;
			}
		};
		FutureTask<Integer> futureTask=new FutureTask<>(callable);
		Thread t1=new Thread(futureTask);
		t1.start();
		System.out.println(futureTask.get());
	}
}
